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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6aa8ecfa0cd962aa9d458e8589fa29782c51ad5d5a1c553c3a0375133d8265' 
  AND token = 'ddpSTA9pI8318ljCgPR9UCV+3FJyURrXnqnrPPHUcks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}